Precipitation of copper



Patented Feb. 6,1940

u-T TATES PRECIPITATION or cor-PER Guenther Hamprecht and GustavPauckner, Ludwigshafen-on-the-Rhine, Germany, assi to I. G.Farbenindustrle g'nors Aktiengesellschaft,

l franktort-on-the-Main, Germarw No Drawing.

Application June 14, 1939, Serial No. 279,052. In Germany lune 29, 1938w 1 Claim.

The present invention relates to improvements in the recovery of copperfrom its solutions by precipitation. p

' It' has already been proposed to precipitate 5 copper from itsaqueoussolutions by means of base metals, as for example nickel.Commercial nickel is, however, relatively passive so that theprecipitation requires very l0ns.,ec0nomica1ly insupportable times it itis desired to obtain solu-' l tions poor in copper. e

It has therefore been proposedto carry out the precipitation of thecopper by nickel at temperatures of more than 100 (2., as for example ati from 160 to 180. C., and at correspondingly increased pressures.

We have now found that nickel which has beenprepared electrolytically.and which hasvnot been remeltedafter its electrolytical deposition isconsiderably more suitable forthe precipitation oi copper trom itssolutions. When usins' such nickel it is not necessary to use eitherlong times or temperatures above 100? C. in order to obtain 7 solutionspoorincopper.

The iollowlnz example will the nature of this invention but theinvention is not restricted to this example.

Example to 36 grams perliter and after 8 hours it amounts 10 toonly 1gram per liter. It the precipitation be effected at 90 C. the coppercontent '8 hours is irom2to3'gramsperliter.

If on the'other hand pieces of sheet nickel which have been obtained bymelting and rolling 15 nickel are used, the solution stillcontains 44grams of copper perliter after 8 hours. v

what weclaimiszr y In the precipitation of comer by means of nickel theuse or nickel which has been prepared electrolytically and which has notbeen remelted Y after its le'ctrolyflcal depos tion. q

a nns'mv venom.

